Internal-combustion engine.



R. H. MCCARTHY.

lNERNAL COMBUSTION ENGINE.

PPLICMION FILED SEPL 26. 1914.

Il III.

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ROBERT H, IiIcC-ARTHY, 0F MADELIA, MINNESOTA.

'NTERNAL-COMBUSTGN ENGENE.

T0 all 'whom it may concern:

Be it known that l, ROBERT H. MCCARTHY, a citizen of the United States, residing at Madelin, in the county of lVatonwan and State of Minnesota, have invented certain new and useful Improvements in internal- Combustion Engines, of which the following is a specification, reference being had to the accompanying drawings.

This invention relates-to internal combustion engines, and has for its primary object to provide an engine of this character capable of developing the power of the ordinary four cylinder gas engine but in which only two engine cylinders are employed.

In its more specific aspect, the invention embodies opposed cylinders, in each of which a piston lis mounted to reciprocate, a coinmonA crank shaft, and improved means for connecting the pistons to said crank shaft.

The invention has for a further object to provide an internal combustion engine of the above character which is extremely simple in its construction, highly efficient and durable in practical operation, and capable of gen- `eri-ating a high working power from a minimum consumption of .the propelling fluid.

W'hth the above and other objects in view, the invention consists in novel features of construction, combination and arrangement of parts as willbe hereinafter referred to and more particularly pointed out inthe specificationv and claims.

y'Flair a full understanding of the invention,

reference is to be had to the following description and"accompanying drawings, in which- Figure 1 is a longitudinal section through an internal combustion .engine emliodying the present invention; F ig. 2 isa plan view thereof, both of the cylinders being shown in section; Fig. 3 is a view similar to Fig. 1 showing .the positionsof the pistons in the respective cylinders reversed; and Fig. l is a section taken on the line ale-4: of Fig. 2.

Referring in detail to the drawings, 5 designates the opposed engine cylinders which are mounted upon a suitable base in dicated at 6. Each cylinder is provided with a water jacket 7, and the ends of the cylinder are closed by the heads 8. piston 9 is mounted to reciprocate in each of the cylinders 5, and is provided adjacent its opposite ends with a series of peripheral packing rings 10. These packing rings and the heads 8 render the ends of the cylinder en Specification of Letters Patent.

Tatented Sept. 2i, i915.

Application filed September 26, 191e. Serial No. 863,652.

solutely air tight.A rThe central portion of each piston 9 is preferably hollow and through the saine the transversely disposed wrist pins 'l1 extend, the ends of said pins projecting through longitudinal slots 12 in the opposite walls of the cylinder The top of the cylinder is formed with an opening which is closed by a cap plate 13. By removing this plate, the wrist pins 11 may be removed when it is desired to remove the piston from the cylinder. I

14: designates the crank shaft which is arranged betweeii the engine cylinders and suitably incascd. with the spaced cranks 15. To the ends of each of the wrist pins 1l rods 1G are rigidly fixed at one of their ends. rlfhese rods which are thus connected to the respective pistons extend inwardly toward the crank shaft and are connected thereto by means of the connecting rods 17, said rods being loosely connected at their opposite ends to the cranks 15 of the engine shaft and to the rods 16 respectively. It will be observed that these latter rods are mo vable through the walls of the water jackets 7 of the engine cylinders.

Each of the engine cylinders is provided at each end with an intake port 18 on one side and upon its opposite side with an eX- haust port 19. rlhe intake ports are connected by a common supply pipe with a car bureter or other suitable gas generator. Referring new to l? ig. 2 wherein l have indicated the operations which have taken place in the respective engine cylinders, it will be noted that the explosion has occurred. in the inner end of one cylinder and the piston therein has been inoved to exhaust the burnt gases from the opposite end of the cylinder. ln this movement of the piston, the crank shaft ll is, of course, turned and through the medium of the rods 1G and 17, the other piston is moved into the inner end of its compresses the charge which.

cylinder and has been previouslvadmitted thereto from the intake port 18. ln this movement of the latter piston, the gases are drawn into the other end of the cylinder. rllhe explosion now takes place in the inner` end of this latter cylinder, the rotation of the crank shaft l-l being thus continued and the charge in the Vopposite end of the cylinder compressed. Yln the other cylinder, the burnt gas is being exhausted from the inner end thereof., while the charge is being drawn into the cuter end of the cylinder. Upon the This shaft is provided` completion of the next half revolution of the engine shaft, the compressed charge in the one cylinder is exploded, While compression takes place in the outward movement o the piston in the other' cylinder. lt will thus he seen that there is an explosion in each half revolution of theengine shaft, the explosion taking place in the opposite ends of each cylinder alternately with. respect to each other.

From the foregoing description taken in connection with the accompanying drawings, it will be seen that l have produced very simple and eilicient engine structure, whereby a high degree oi` operating energy may be obtained.` The engine may be, therefore, compactly and inexpensively constructed.y thus admitting ot its use in connection V.with automobiles, traction engines, and similar vehicles. lt will also be seen that there is a direct longitudinal thrust from each of the pistons by reason of the rigid connection of the rod 1,6 thereto, which is converted into a rotary movement of the crank shaft 14 by means of the connecting .rods 17. As the engine cylinders are absolutely' air tight, loss of compression is cflectually precluded. My improved engine' is also vvery durable in its construction, and not liable to easily get out of order.

-While I have above described the pre ferred form, construction, and arrangement of the several elements employed, it will, be understood that the device is, novm 'ertheless, susceptible el considerable modification therein, anl l therefore rese the privilelgfe of resorting' to all such legit changes as may be fairly embodied within the spirit and scope oi the iinf'ention claimed.

Nhat is claimed 1. In an internal combustion engine, op-

posed engine cylinders, a piston to operate in cach of said cylinders, each cylinder loe ingr provided with a Water jacket, a transversely disposed wrist pin centrally con nccted to cach piston and projecting from opposite sides thereof, each of the cylinders being provided in each end with an intake port and an exhaust port,'an engine shai't provided with spaced cranks, thrust rods rigidly connected to the ends oi' each wrist pin and movably disposed through the Vallsr ot' the water jacket of the engine cylinfiler, and connecting rods pivotally connected at one of their ends to said'thrust rods, the connecting rods which are connected to the thrust rods on each side of the engine 'being pivotally connected at their other ends to the respective cranks of the engine shaft.

2. ln an engine ot' the character described, opposed cylinders, a piston' to operate in each of said cylinders and provided. 'with wrist pins, the cylinder Wall haringl longitudinal slots in opposite sides through which said wrist pins extend, each or the cylinders being provided with a Water jacket, longitudinal rods slidably mounted in the walls of the Water jackets and connected at one of their ends to said Wrist pins, a power shaft having spaced cranks extending' uponthe same side of 'its axis, and connecting rods between the slide rods on each side of the'engine and the re` spective cranks to reciprocate the pistons in the same direction Within the respective cylii'iders.

ln testimony whereof l hereunto aiiix my signature in the presence of two Witnesses.

RGBERT H. MGCRTHY, I

"Ji/litnesses: l

J. E. Hafcnorrr, Feci-sin Bussen. l 

